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27 package integration.forms;
28 
29 /** base class for components validating the content of form controls
30  *
31  * @author  fs@openoffice.org
32  */
33 public abstract class ControlValidator implements com.sun.star.form.validation.XValidator
34 {
35 
36     /** Creates a new instance of ControlValidator */
37     public ControlValidator()
38     {
39     }
40 
41     public void addValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
42     {
43     }
44 
45     public void removeValidityConstraintListener(com.sun.star.form.validation.XValidityConstraintListener xValidityConstraintListener)
46     {
47     }
48 
49     protected boolean isVoid( Object Value )
50     {
51         try
52         {
53             return ( com.sun.star.uno.AnyConverter.getType(Value).getTypeClass()
54                      == com.sun.star.uno.TypeClass.VOID );
55         }
56         catch( java.lang.ClassCastException e )
57         {
58         }
59         return false;
60     }
61 }
62